Transmitting objects over a small LAN with only trusted clients

Hey,
I'm currently writing an application which handles the time some users work on given projects (I know there are already solutions for that but my main aspect is learning more :)). The users, projects and time are stored in a database. Now I want to transmit some objects (specific users and so on) about the LAN from server to client. Can I do this with RMI/Serialization, or do I have to use something different? Also, it would be nice if anybody had a nice tutorial for that :)
Thanks in advance!